stewart



(No Model.)

M. A. STEWART.

LIFTING JACK.

No. 410,995. Patented Sept. 10, 1889.

UNITED STATES PATENT OFFICE.

MAJOR A. STE /VART, OF KINGSTON, INDIANA, ASSIGNOR OF ONE-HALF TOWILLIAM K. STENART, OF SAME PLACE.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 410,995, dated.September 10, 1889.

Application filed July 8,1889. Serial No. 316 ,84'7. (No model.)

To all whom it may concern: block is slightly convexed, as shown at it,so

Be it known that I, MAJOR A. STEWART, a that the bearing of the cam-faceof the op- 55 citizen of the United States, residing at Kin gserating-lever shall be gradual thereon, so ton, in the county of Decatur andState of that it will more readily and quickly and Indiana, haveinvented certain new and useeasily elevate the block as it is moved forful Improvements in Lifting-Jacks; and I do that purpose. The frontguide-piece also has herebydeclarethatthefollowing isafull,clear, itsbottom convened, as shown, to prevent 60 and exact description of thesame, reference any sharp corners against which the lever being had tothe annexed drawings, making might come in contact, and in this way preapart of this specification, and to the letters vents wear. The lower endof the rear guideand figures of reference marked thereon. piece extendsat an angle of about forty-five This invention relates to certain newand degrees, as shown, for a purpose hereinafter 65 useful improvementsin lifting-jacks; and it set forth. has for its object to provide adevice of this E is the operating-lever, fulcrumed on the [5 class whichshall be simple, strong, and very transverse pin or bolt 2', providedwith nut t",

efficient in use. and having a cam-facej, as shown. The in- The noveltyin the present instance resides ner face of the handle of the lever,where it 70 in the peculiarities of construction and the joins the cam,extends therefrom at such an combinations, arrangement, and adaptationangle that as the parts are in the position of parts, all as more fullyhereinafter deshown in full lines in Fig. 1 the inclined scribed, shownin the drawings, and then parlower face of the rear guide-piece iscoinciticularly pointed outin the appended claim. dent therewith, andserves to cover the slot 75 The invention is clearly illustrated in theand prevent dirt from getting in and on the accompanying drawings,which, with the letcam-face of the lever. The cam-face serves :15 tersof reference marked thereon, form a part as an automatic lock to holdthe parts in any of this specification, and in whichand all of theiradjusted positions.

Figure 1 is a perspective view of a lifting- In order to strengthen thelifting-block O, 80 jack embodying my improvements. Fig. 2 I employ thebolts or rods m, which are passed is a like View of the parts thereofdetached. through the same from the rear to the front Referring now tothe details of the drawguide-pieces. In practice this construction ingsby letter, A designates a suitable base has proved to form a very strongblock. from which rises the post or standard B, WVhat I claim as new is8 5 which is bifurcated vertically to provide the The lifting-jackdescribed, consisting of space a in which the lifting-lever and blockthe base,the slotted standard supported there- 3 5 work. The upper endsof the bifurcations on, the operating-lever fulcrumed on said of thispost are provided with a series of standard, the inner face of thehandle of the shoulders Z). lever at its junction with the cam extending90 G is the lifting-block, formed with the at substantially a rightangle, as shown, and shoulders c, which are formed upon the upthelifting-block free to move vertically in per end of the central portionor web F of the slot of the standard and formed with centhe block, whichweb is provided with a lontralweb having convexed lower face and withgitudinal slot (1, through which passes loosely rear and frontguide-pieces, the lower edge 5 the transverse screw-threaded bolt or rodD, of the front one being convexed and the lower which passes throughthe bifurcations of the edge of the rear one inclined upward, subpost,and is provided upon one end with a stantially as herein shown anddescribed, and

nut e, by means of which it is retained in for the purpose specified.place, and which provides for the ready sepa- In testimony that I claimthe above I have I00 ration of the parts when occasion may rehereuntosubscribed my name in the presence quire. This block is formed with thefront of two witnesses. and rear guide-pieces f and g, which embraceopposite sides of the post and serve to guide Witnesses: the block andprevent sidewise movement ALMON S. CREATE, thereof. The bottom edge ofthe web of the GEORGE H. DUNN.

MAJOR A. STEWVART.

